23LCV512 MBED STM32 Driver code

23LCV512 MBED STM32 Driver code

/*
 * Library to interface with the 23LCV512 SRAM microchip.
 *
 * Apache2 licensed
 * Written by James Kidd 2014
 * */
#include "mbed.h"
enum SRAM_MODE {
	BYTE_MODE = 0x00,
	SEQ_MODE = 0x40
};
enum SRAM_COMMAND {
	WRITE_STATUS = 0x01,
	WRITE = 0x02,
	READ = 0x03,
	READ_STATUS = 0x05,
	EDIO = 0x3B,
	RST_DIO = 0xFF
};

class SRAM23LCV {
    private:
    SPI& _spi;
    DigitalOut _cs;
    SRAM_MODE getMode();
    void setMode(SRAM_MODE mode);
    void sendCommand(int command, uint16_t address);

    public:
    SRAM23LCV(SPI& spi,PinName cs);
    ~SRAM23LCV();
    uint8_t read(uint16_t address);
    void read(uint16_t address, char * buffer, uint16_t count);
    void write(uint16_t address, uint8_t data);
    void write(uint16_t address, char * buffer, uint16_t count);

    //No idea if these should be inline or not, seems like a good idea?
    //inline
    	void select() { _cs = 0; }
    //inline
        void deselect() { _cs = 1; }
    };



//end .h


#include "SPI.h"
#include "DigitalOut.h"
#include "SRAM23LCV.h"
SRAM23LCV::SRAM23LCV(SPI& spi, PinName cs) : _spi(spi), _cs(cs) {
    deselect();
    }
void SRAM23LCV::setMode(SRAM_MODE mode) {
	select();
	_spi.write((char)WRITE_STATUS);
	_spi.write((char)mode);
	deselect();
}

SRAM_MODE SRAM23LCV::getMode() {
	select();
	_spi.write((int)READ_STATUS);
	return (SRAM_MODE)_spi.write(0);
	deselect();
}


uint8_t SRAM23LCV::read(uint16_t address) {
	sendCommand(READ,address);
	uint8_t result = 0;
	result = _spi.write(0);
	deselect();
	return result;
}

void SRAM23LCV::read(uint16_t address, char * buffer, uint16_t count){
	setMode(SEQ_MODE);
	sendCommand(READ,address);
	for(int i = 0; i < count;i++){
		buffer[i] = (char)_spi.write(0);
	}
	setMode(BYTE_MODE);
	deselect();
}

void SRAM23LCV::write(uint16_t address,uint8_t data) {
		sendCommand(WRITE,address);
		_spi.write((char)data);
		deselect();
}

void SRAM23LCV::write(uint16_t address, char * buffer, uint16_t count) {
	setMode(SEQ_MODE);
		sendCommand(WRITE,address);
		for(int i = 0; i < count;i++){
			_spi.write((char)buffer[i]);
		}
	setMode(BYTE_MODE);
	deselect();
}

void SRAM23LCV::sendCommand(int command, uint16_t address){
    select();
	_spi.write((char)command);
	_spi.write(address >> 8);
	_spi.write(address & 0xFF);
}